Prepare pizza crust according to package directions. Preheat oven to 400°F.
Line a baking sheet with foil and place an inverted 9x13-inch baking dish on it. Coat with cooking spray.
Mix olive oil, garlic powder, and salt in a small bowl.
Stretch dough into a rectangle slightly larger than the baking dish. Drape over the inverted dish with 1½ inches hanging over each side.
Brush dough all over with oil mixture and bake 12-15 minutes until golden brown. Cool for 30 minutes.
Make dressing by combining oil, vinegar, parmesan, garlic, oregano, salt, and pepper in a jar with lid. Shake well.
In a large bowl, mix romaine, radicchio, artichokes, red peppers, olives, and pepperoncini. Toss with two-thirds of the dressing.
Add salami, pepperoni, mozzarella, and provolone, gently folding to combine.
Carefully flip cooled pizza crust onto a serving platter and fill with salad.
Use scissors to cut through the crust and serve with extra dressing on the side.
